Using PIVOT SQL to transform the table

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Hi I have a table

_____|__________|_________|_______________|____...
Total| National	| Foreign |   Category    |...
_____|__________|_________|_______________|____...
1.00 |  2.00	| 98.00	  |  Professional |...
1.00 |  2.00	| 98.00	  |  Professional |...
1.00 |  4.00	| 96.00	  |  Professional |...
2.00 |  4.00	| 96.00	  |  Marketing    |...
2.00 |  4.00	| 96.00	  |  Marketing    |...
  .  |    .     |   .     |     .         | .
  .  |    .     |   .     |     .         | .
  .  |    .     |   .     |     .         | .

I want the output in the form

_______________________________________________...
              |Professional	|Marketing|...
______________|_________________|_________|____...
Total 	      |		        |         |...
Foreign	      |                 |         |...
National      |			|         |...

the query that i have written

SQL

DECLARE @cols AS VARCHAR(MAX)
select @cols = STUFF((SELECT distinct ',' + QUOTENAME(Category)
            FROM Service
            FOR XML PATH(''), TYPE
            ).value('.', 'VARCHAR(MAX)')
        ,1,1,'')

--print @cols

set @query = 'SELECT * FROM
                            (
                                SELECT
                                        [Total],
                                        [Nationally],
                                        [Foreign],
                                        [Category]
                                FROM
                                        Service
                            ) AS source
                        PIVOT
                            (
                                AVG([Total])
                                FOR [Category] IN ('+@cols+')
                            ) p'
execute( @query)

This query is not working properly
Please Help
thanks in advance

Posted 16-Mar-14 7:10am

write2varun

Updated 16-Mar-14 7:55am

v2

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Maciej Los · Accepted Answer · 2014-03-16T07:45:00

You need to UNPIVOT[^] data, than to use aggregate functions[^] ;)

See below example:

SQL

DECLARE @tmp TABLE (Total DECIMAL(8,2), [National] DECIMAL(8,2), [Foreign]  DECIMAL(8,2), Category VARCHAR(30))

INSERT INTO @tmp (Total, [National], [Foreign], Category )
VALUES(1.00 ,  2.00	, 98.00, 'Professional'),
(1.00 ,  2.00	, 98.00, 'Professional'),
(1.00 ,  4.00	, 96.00, 'Professional'),
(2.00 ,  4.00	, 96.00, 'Marketing'),
(2.00 ,  4.00	, 96.00, 'Marketing')

--aggregate data
SELECT Category, Description, SUM(Value) AS SumOfValue
FROM (
	--unpivot data
	SELECT Category, [Description], [Value]
	FROM (
		SELECT *
		FROM @tmp
		) AS pvt
	UNPIVOT ([Value] FOR [Description] IN ([Total],[National], [Foreign])) AS unpvt
	) AS T
GROUP BY Category, [Description]
ORDER BY Category, [Description]

Result:

Category        Description     SumOfValue
Marketing	Foreign		192.00
Marketing	National	8.00
Marketing	Total		4.00
Professional	Foreign		292.00
Professional	National	8.00
Professional	Total		3.00

If you don't want to display Category, remove it from first SELECT list and GROUP BY option.

Of course, it is possible to pivot data again:

SQL

--pivot data
SELECT [Description], [Professional], [Marketing]
FROM (
	--unpivot data
	SELECT Category, [Description], [Value]
	FROM (
		SELECT *
		FROM @tmp
		) AS pvt
	UNPIVOT ([Value] FOR [Description] IN ([Total],[National], [Foreign])) AS unpvt
	) AS DT
PIVOT(SUM([Value]) FOR [Category] IN ([Professional], [Marketing])) AS PT

Than result is:

Category	Professional	Marketing
Foreign		292.00		192.00
National	8.00		8.00
Total		3.00		4.00